Abstract

We have measured the Hall effect and the magnetoresistance of epitaxialthin filmsgrown on MgO (001) in magnetic fields up to 30 T. Using such high fields, it is possible to magnetically saturate films thicker than 40 nm, providing access to intrinsic conduction properties. We find an effective electron density corresponding to 1 electron per f.u. A smaller value is obtained for thinner films, caused by the increasing density of antiphase boundaries defects. The magnetoresistance is not saturating at 30 T, showing linear dependence at high fields, and peaks at the Verwey transition.

Received 04 November 2009Accepted 02 December 2009Published online 31 December 2009

Acknowledgments:

Funding by the Spanish Ministry of Science (through Project No. MAT2008-06567-C02, including FEDER funding), the Aragon Regional Government (Grant No. E26), and EuroMagNET under the EU Contract No. RII3-CT-2004-506239 are acknowledged.